INJECTION MOLDING DIE FOR MESH FILTER AND INJECTION MOLDING METHOD FOR MESH FILTER

Abstract

Four gates are provided in one end surface of the inner cylinder cavity section of an injection molding die along the circumferential direction of an inner cylinder cavity section. The gates are disposed in intermediate parts between a first central line and a second central line when the first central line passes through the center of the inner cylinder cavity section in parallel to the X-axis and the second central line passes through the center of the inner cylinder cavity section 1 in parallel to the Y-axis on an X-Y plane orthogonal to a central axis of the inner cylinder cavity section. The gates are opened in the positions in which the filling rate is apt to reduce in the filter portion cavity section and the gates are not opened in the positions in which the filling rate is apt to increase in the filter portion cavity section.

Claims

1. An injection molding die for a mesh filter used to filter out foreign matter in a fluid, wherein the mesh filter includes a cylindrical inner cylinder, a cylindrical outer cylinder surrounding the inner cylinder, and a filter portion connecting an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder along a radial direction of the inner cylinder, wherein the filter portion is formed along an X-Y plane that is a virtual plane orthogonal to a central axis of the inner cylinder, wherein a plurality of rectangular openings is formed in a part of the filter portion, the part being other than the connection portion between the inner cylinder and the outer cylinder, by a plurality of vertical ribs formed at regular intervals so as to be orthogonal to the X-axis and parallel to the Y-axis and a plurality of horizontal ribs formed at regular intervals so as to be orthogonal to the vertical ribs and parallel to the X-axis, wherein an inner cylinder cavity section for shaping the inner cylinder of a cavity for shaping the mesh filter is provided with four gates opened in positions in which end surfaces of the inner cylinder are shaped, the four gates being formed along the circumferential direction of the inner cylinder cavity section, wherein the gates are disposed in intermediate parts between a first central line and a second central line on an X-Y plane, the first central line passing through the center of the inner cylinder cavity section in parallel to the X-axis, the second central line passing through the center of the inner cylinder cavity section in parallel to the Y-axis, the X-Y plane being a virtual plane orthogonal to a central axis of the inner cylinder cavity section, and wherein molten resin having been injected from the gates to the inner cylinder cavity section flows from the inner cylinder cavity section to a filter portion cavity section for shaping the filter portion and then fills an outer cylinder cavity section for shaping the outer cylinder from the filter portion cavity section.

2. An injection molding die for a mesh filter used to filter out foreign matter in a fluid, wherein the mesh filter includes a cylindrical inner cylinder, a cylindrical outer cylinder surrounding the inner cylinder, and a filter portion connecting an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder along a radial direction of the inner cylinder, wherein the filter portion is formed along an X-Y plane that is a virtual plane orthogonal to a central axis of the inner cylinder, wherein a plurality of rectangular openings is formed in a part of the filter portion, the part being other than the connection portion between the inner cylinder and the outer cylinder, by a plurality of vertical ribs formed at regular intervals so as to be orthogonal to the X-axis and parallel to the Y-axis and a plurality of horizontal ribs formed at regular intervals so as to be orthogonal to the vertical ribs and parallel to the X-axis, wherein an inner cylinder cavity section for shaping the inner cylinder of a cavity for shaping the mesh filter is provided with four gates opened in positions in which end surfaces of the inner cylinder are shaped, the four gates being formed along the circumferential direction of the inner cylinder cavity section, wherein the gates are disposed in positions by rotating 45 degrees from a first central line and a second central line along the circumferential direction of the inner cylinder cavity section, an X-Y plane being a virtual plane orthogonal to a central axis of the inner cylinder cavity section, the first central line passing through the center of the inner cylinder cavity section in parallel to the X-axis on the X-Y plane, the second central line passing through the center of the inner cylinder cavity section in parallel to the Y-axis on the X-Y plane, wherein molten resin having been injected from the gates to the inner cylinder cavity section flows from the inner cylinder cavity section to a filter portion cavity section for shaping the filter portion and then fills an outer cylinder cavity section for shaping the outer cylinder from the filter portion cavity section.

3. An injection molding method for a mesh filter used to filter out foreign matter in a fluid, wherein the mesh filter includes a cylindrical inner cylinder, a cylindrical outer cylinder surrounding the inner cylinder, and a filter portion connecting an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder along a radial direction of the inner cylinder, wherein the filter portion is formed along an X-Y plane that is a virtual plane orthogonal to a central axis of the inner cylinder, wherein a plurality of rectangular openings is formed in a part of the filter portion, the part being other than the connection portion between the inner cylinder and the outer cylinder, by a plurality of vertical ribs formed at regular intervals so as to be orthogonal to the X-axis and parallel to the Y-axis and a plurality of horizontal ribs formed at regular intervals so as to be orthogonal to the vertical ribs and parallel to the X-axis, wherein an inner cylinder cavity section for shaping the inner cylinder of an injection molding die for the mesh filter is provided with four gates opened in positions in which end surfaces of the inner cylinder are shaped, the four gates being formed along the circumferential direction of the inner cylinder cavity section, wherein the gates are disposed in intermediate parts between a first central line and a second central line on an X-Y plane, the first central line passing through the center of the inner cylinder cavity section in parallel to the X-axis, the second central line passing through the center of the inner cylinder cavity section in parallel to the Y-axis, the X-Y plane being a virtual plane orthogonal to a central axis of the inner cylinder cavity section, and wherein the mesh filter is formed by injecting molten resin from the gates to the inner cylinder cavity section, feeding the molten resin having been injected to the inner cylinder cavity section from the inner cylinder cavity section to a filter portion cavity section for shaping the filter portion and then filling an outer cylinder cavity section for shaping the outer cylinder with the molten resin from the filter portion cavity section.

4. An injection molding method for a mesh filter used to filter out foreign matter in a fluid, wherein the mesh filter includes a cylindrical inner cylinder, a cylindrical outer cylinder surrounding the inner cylinder, and a filter portion connecting an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder along a radial direction of the inner cylinder, wherein the filter portion is formed along an X-Y plane that is a virtual plane orthogonal to a central axis of the inner cylinder, wherein a plurality of rectangular openings is formed in a part of the filter portion, the part being other than the connection portion between the inner cylinder and the outer cylinder, by a plurality of vertical ribs formed at regular intervals so as to be orthogonal to the X-axis and parallel to the Y-axis and a plurality of horizontal ribs formed at regular intervals so as to be orthogonal to the vertical ribs and parallel to the X-axis, wherein an inner cylinder cavity section for shaping the inner cylinder of an injection molding die for the mesh filter is provided with four gates opened in positions in which end surfaces of the inner cylinder are shaped, the four gates being formed along the circumferential direction of the inner cylinder cavity section, wherein the gates are disposed in positions by rotating 45 degrees from a first central line and a second central line along the circumferential direction of the inner cylinder cavity section, an X-Y plane being a virtual plane orthogonal to a central axis of the inner cylinder cavity section, the first central line passing through the center of the inner cylinder cavity section in parallel to the X-axis on the X-Y plane, the second central line passing through the center of the inner cylinder cavity section in parallel to the Y-axis on the X-Y plane, and wherein the mesh filter is formed by injecting molten resin from the gates to the inner cylinder cavity section, feeding the molten resin having been injected to the inner cylinder cavity section from the inner cylinder cavity section to a filter portion cavity section for shaping the filter portion and then filling an outer cylinder cavity section for shaping the outer cylinder with the molten resin from the filter portion cavity section.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a diagram illustrating a mesh filter molded by an injection molding die and an injection molding method according to the first embodiment of the invention, FIG. 1A is a front view illustrating the mesh filter, FIG. 1B is a side view illustrating the mesh filter, FIG. 1C is a back view illustrating the mesh filter, FIG. 1D is a cross sectional view illustrating the mesh filter taken along line A1-A1 in FIG. 1A, FIG. 1E is an enlarged view illustrating part B1 in FIG. 1A, FIG. 1F is a cross sectional view taken along line A2-A2 in FIG. 1E, and FIG. 1G is a cross sectional view taken along line A3-A3 in FIG. 1E.

[0021] FIG. 2 is a diagram illustrating the injection molding die according to the first embodiment of the invention, FIG. 2A is a vertical cross sectional view illustrating the injection molding die, FIG. 2B is an enlarged view illustrating part B2 in FIG. 2A, FIG. 2C is a plan view illustrating a part of a second die seen from direction D1 in FIG. 2B, and FIG. 2D is a plan view illustrating a first die seen from direction D2 in FIG. 2A in the state in which the die is opened.

[0022] FIG. 3 is a diagram (diagram corresponding to FIG. 2B) illustrating a first modification of the injection molding die, more specifically a modification of projections for shaping the openings of the mesh filter.

[0023] FIG. 4 is a diagram illustrating a second modification of the injection molding die, more specifically a diagram (the drawing corresponds to FIG. 2B) illustrating a modification of projections for shaping the openings of the mesh filter.

[0024] FIG. 5 is a diagram illustrating a mesh filter according to a first conventional example, FIG. 5A is a front view illustrating the mesh filter, FIG. 5B is a cross sectional view illustrating the mesh filter taken along line A4-A4 in FIG. 5A, and FIG. 5C is an enlarged view illustrating part B3 in FIG. 5A.

[0025] FIG. 6 is a diagram illustrating an injection-molded gear, FIG. 6A is a front view illustrating the gear, and FIG. 6B is a cross sectional view illustrating the gear taken along line A5-A5 in FIG. 6A.

[0026] FIG. 7 is a diagram illustrating an injection-molded mesh filter according to a conventional example (second conventional example), FIG. 7A is a front view illustrating the mesh filter, FIG. 7B is a cross sectional view illustrating the mesh filter taken along line A6-A6 in FIG. 7A, and FIG. 7C is an enlarged view illustrating part B4 in FIG. 7A.

[0027] FIG. 8 is a diagram illustrating an injection molding die for a gear, FIG. 8A is a vertical cross sectional view illustrating the injection molding die for a gear, and FIG. 8B is a plan view (in which the first die is seen along direction D3 in FIG. 8A) illustrating the first die in the state in which the second die is opened.

[0028] FIG. 9 is a diagram illustrating an injection molding die for the mesh filter according to the second conventional example, FIG. 9A is a vertical cross sectional view illustrating the injection molding die for the mesh filter, FIG. 9B is a plan view (in which the second die is seen along direction D4 in FIG. 9A and the gates of the first die are superimposed thereon) illustrating the second die in the state in which the second die is opened, FIG. 9C is an enlarged view illustrating part B5 in FIG. 9B, FIG. 9D is an enlarged view illustrating part B6 in FIG. 9B, and FIG. 9E is an enlarged view illustrating part B7 in FIG. 9B.

DESCRIPTION OF EMBODIMENTS

[0029] An embodiment of the invention will be described below with reference to the drawings.

First Embodiment

[0030] FIG. 1 is a diagram illustrating the mesh filter 1 injection-molded by the injection molding die 10 and the injection molding method according to the invention. FIG. 1A is a front view illustrating the mesh filter 1, FIG. 1B is a side view illustrating the mesh filter 1, FIG. 1C is a back view illustrating the mesh filter 1, FIG. 1D is a cross sectional view illustrating the mesh filter 1 taken along line A1-A1 in FIG. 1A. In addition, FIG. 1E is an enlarged view (partial enlarged view illustrating the mesh filter 1) illustrating part B1 in FIG. 1A, FIG. 1F is a cross sectional view (partial enlarged cross sectional view illustrating the mesh filter 1) taken along line A2-A2 in FIG. 1E, and FIG. 1G is a cross sectional view (partial enlarged cross sectional view illustrating the mesh filter 1) taken along line A3-A3 in FIG. 1E.

[0031] As illustrated in FIG. 1, the mesh filter 1 integrally includes the cylindrical inner cylinder 2 (inner frame), the cylindrical outer cylinder 3 (outer frame surrounding the inner frame) concentric with the inner cylinder 2, the filter portion 4 connecting the outer peripheral surface 2a of the inner cylinder 2 and the inner peripheral surface 3a of the outer cylinder 3 along the radial direction. The entire mesh filter 1 is integrally formed of a resin material (for example, nylon 66). The mesh filter 1 as described above is disposed in, for example, a fuel supply pipe connected to the fuel injection apparatus of a vehicle. The inner cylinder 2 and the outer cylinder 3 are attached to the fuel supply pipe or the like via a seal member (not illustrated) so as to prevent the fuel (fluid) passing through the filter portion 4 from leaking. In addition, in the embodiment, the outer diameter of the inner cylinder 2 is 10 mm and the outer diameter of the outer cylinder 3 is 16 mm. In addition, the wall thickness of the inner cylinder 2 is 1 mm and the wall thickness of the outer cylinder 3 is 1 mm. It should be noted that the values related to the inner cylinder 2 and the outer cylinder 3 are only examples for easy understanding of the invention and are changed as appropriate depending on the use conditions and the like.

[0032] The inner cylinder 2 and the outer cylinder 3 have the same length L1 along the central axis 5, have the one end surfaces 2b and 3b along the central axis 5 positioned on the same virtual plane orthogonal to the central axis 5, and have the other end surfaces 2c and 3c along the central axis 5 positioned on the same virtual plane orthogonal to the central axis 5. The relationship between the inner cylinder 2 and the outer cylinder 3 is not limited to the embodiment, the inner cylinder 2 and the outer cylinder 3 may be deformed depending on the state in which the mesh filter 1 is attached, the dimensions of the inner cylinder 2 and the outer cylinder 3 along the central axis 5 may be different from each other, and the one end surface 2b of the inner cylinder 2 along the central axis 5 may deviate from the one end surface 3b of the outer cylinder 3 along the central axis 5. In addition, the other end surface 2c of the inner cylinder 2 along the central axis 5 may deviate from the other end surface 3c of the outer cylinder 3 along the central axis 5. It should be noted that, as illustrated in FIG. 1C, the one end surface (right end surface) 2b of the inner cylinder 2 has four gate cut-off marks disposed at regular intervals along the circumferential direction.

[0033] The filter portion 4 is formed along the X-Y plane that is a virtual plane orthogonal to the direction along the central axis 5 of the inner cylinder 2. The plurality of rectangular openings 8 is formed in the part of the filter portion 4, the part being other than the connection portion between the inner cylinder 2 and the outer cylinder 3, by the plurality of vertical ribs 6 formed at regular intervals so as to be orthogonal to the X-axis and parallel to the Y-axis and the plurality of horizontal ribs 7 formed at regular intervals so as to be orthogonal to the vertical ribs 6 and parallel to the X-axis. Although the filter portion 4 is formed so as to connect, in the radial direction, the central portions of the inner cylinder 2 and the outer cylinder 3 along the central axis 5, the invention is not limited to the example and deviation to the position close to one ends of the inner cylinder 2 and the outer cylinder 3 along the central axis 5 or deviation to the position close to the other ends of the inner cylinder 2 and the outer cylinder 3 along the central axis 5 may be allowed.

[0034] An example of the dimensions of the filter portion 4 will be described below to make it easy to understand the filter portion 4 of the mesh filter 1 formed by the injection molding die 10 and the injection molding method according to the invention. First, the opening 8 of the mesh filter 1 is 0.1 mm square. In the vertical rib 6 and the horizontal rib 7, the rib width dimensions L2 and L3 (dimension L2 along the X-axis in FIG. 1E or dimension L3 along the Y-axis in FIG. 1E) between the adjacent openings 8 and 8 is 0.1 mm. In addition, the dimensions (thicknesses) L4 and L5 of the vertical rib 6 and the horizontal rib 7 along the direction (Z-axis direction in FIG. 1F or Z-axis direction in FIG. 1G) of the central axis 5 of the inner cylinder 2 are 0.3 mm. In addition, in the filter portion 4, as illustrated in FIG. 1A, the radial dimension L6 along the X-axis is set to an appropriate value from 2 mm to 5 mm depending on the structure of the mount portion of the mesh filter 1 or the like. It should be noted that the dimensions of the filter portion 4 of the mesh filter 1 injection-molded by the injection molding die 10 and injection molding method according to the invention are not limited to the above values L2 to L6.

[0035] FIG. 2 is a diagram illustrating the injection molding die (referred to below as the die) 10 used for the injection molding of the mesh filter 1. In FIG. 2, FIG. 2A is a vertical cross sectional view illustrating the die 10, FIG. 2B is an enlarged view (partial enlarged cross sectional view of the die 10) illustrating part B2 in FIG. 2A, FIG. 2C is a plan view illustrating a part of a second die 12 seen from direction D1 in FIG. 2B, and FIG. 2D is a plan view illustrating a first die 11 seen from direction D2 in FIG. 2A in the state in which the die 10 is opened. The die 10 for the mesh filter 1 according to the embodiment will be described together with the injection molding method for the mesh filter 1.

[0036] As illustrated in FIG. 2A, the die 10 is provided with the cavity 13 for injection molding of the mesh filter 1 in the parts of the first die 11 and the second die 12 close the die matching surface. The cavity 13 includes the cylindrical inner cylinder cavity section 14 for shaping the inner cylinder 2 of the mesh filter 1, the outer cylinder cavity section 15 for shaping the outer cylinder 3 of the mesh filter 1, and the hollow discoid filter portion cavity section 16 for shaping the filter portion 4 of the mesh filter 1. The first die 11 has the four gates 18 opened in one end surfaces 14a of the inner cylinder cavity section 14 along the central axis 17 so that the four gates 18 are provided at regular intervals along the circumferential direction of the inner cylinder cavity section 14 (see FIG. 2D).

[0037] As illustrated in FIG. 2D, when an X-Y plane is a virtual plane orthogonal to the central axis 17 of the inner cylinder cavity section 14, the first central line 20 passes through the center of the inner cylinder cavity section 14 in parallel to the X-axis on the X-Y plane, and the second central line 21 passes through the center of the inner cylinder cavity section 14 in parallel to the Y-axis on the X-Y plane, then the gates 18 are disposed in the positions obtained by rotating 45 degrees (0=45 degrees) from the first central line 20 and the second central line 21 along the circumferential direction of the inner cylinder cavity section 14.

[0038] In addition, as illustrated in FIGS. 2B and 2C, the part of the second die 12 for shaping the filter portion cavity section 16 has a plurality of projections 22 (as many projections 22 as the openings 8) disposed at regular intervals. The shape of the projections 22 formed in the part of the second die 12 for shaping the filter portion cavity section 16 is a square in plan view (seen from direction D1 in FIG. 2B) and the dimension L7 of one side of the square is set to a value (for example, 0.1 mm) that enables the square openings 8 to be shaped. In addition, the projections 22 formed in the part of the second die 12 for shaping the filter portion cavity section 16 are formed so as to have a height (dimension L8 along the Z-direction in FIG. 2B) equal to the thickness (for example, 0.3 mm) of the vertical ribs 6 and the horizontal ribs 7.

[0039] As described in FIG. 2A, when the first die 11 and the second die 12 are closed in the die 10 having the structure as described above, the cavity 13 for shaping the mesh filter 1 is formed in the parts of the first die 11 and the second die 12 close the die matching surface. In addition, vertical rib formation grooves 23 and horizontal rib formation grooves 24 are formed between the projections 22 and 22 of the filter portion cavity section 16 of the cavity 13. The molten resin having been injected to the inner cylinder cavity section 14 from the four gates 18 opened in one end surface 14a (the position in which the one end surface 2b of the inner cylinder 2 is shaped) of the inner cylinder cavity section 14 radially flows from the inner cylinder cavity section 14 to the filter portion cavity section 16. At this time, the gates 18 are disposed in intermediate parts between the first central line 20 and the second central line 21, the gates 18 are opened in the positions in which the filling rate is apt to reduce in the filter portion cavity section 16, and the gates 18 are not opened in the positions in which the filling rate is apt to increase in the filter portion cavity section 16. Accordingly, the injection pressure is easily applied to positions in which the filling rate is apt to reduce in the filter portion cavity section 16 and the injection pressure is not easily applied to positions in which the filling rate is apt to increase in the filter portion cavity section 16. As a result, in the molten resin having been injected from the gates 18 to the inner cylinder cavity section 14, the flowing (the flowing, in zigzags, in the vertical rib formation grooves 23 and the horizontal rib formation grooves 24 between the projections 22 and 22 (see flow F3 in FIG. 9E)) from the opening positions of the gates 18 to the radial outside of the filter portion cavity section 16 is promoted, the flowing (the flowing in the horizontal rib formation grooves 24 between the projections 22 and 22 linearly along the first central line 20 (see flow F1 in FIG. 9C) and the flowing in the vertical rib formation grooves 23 between the projections 22 and 22 linearly along the second central line 21 (see flow F2 in FIG. 9D)) from the intermediate part between the adjacent gates 18 and 18 to the radial outside of the filter portion cavity section 16 are suppressed, thereby suppressing variations in the filling rate in the cavity 13.

[0040] After that, the molten resin flows to the outer cylinder cavity section 15 from the filter portion cavity section 16, the outer cylinder cavity section 15 is filled with the molten resin, the pressure in the cavity 13 is held at a predetermined pressure when the entire cavity 13 of the die 10 is filled with the molten resin, and then the die 10 is cooled. Next, the second die 12 is separated in the C direction from the first die 11 (opened), the mesh filter 1 in the cavity 13 is pushed out of the cavity 13 by an ejector pin (not illustrated), and the mesh filter 1, which is an injection-molded article, is removed from the die 10 (see FIG. 1). In the mesh filter 1 injection-molded in this way, the injection pressure is not easily applied to the parts (the vicinity of the first central line 20 and the vicinity of the second central line 21) of the filter portion 4 in which burrs are easily generated, so occurrence of burrs in the openings 8 of the filter portion 4 is suppressed.

[0041] In the injection molding die 10 and the injection molding method according to the embodiment as described above, the four gates 18 opened in one end surface 14a (the position in which one the end surface 2b of the inner cylinder 2 is shaped) are provided along the circumferential direction of the inner cylinder cavity section 14, the gates 18 are disposed in intermediate parts between the first central line 20 and the second central line 21, the gates 18 are opened in the positions in which the filling rate is apt to reduce in the filter portion cavity section 16, and the gates 18 are not opened in the positions in which the filling rate is apt to increase in the filter portion cavity section 16. Accordingly, it is possible to suppress variations in the filling rate of molten resin in the cavity 13 and suppress the occurrence of burrs in the openings 8 of the filter portion 4 of the injection-molded mesh filter 1.

[0042] In addition, in the mesh filter 1 injection-molded by the injection molding die 10 and injection molding method according to the embodiment, since the occurrence of burrs in the openings 8 of the filter portion 4 can be suppressed, the filtering function in the filter portion 4 is improved.

(First Modification)

[0043] FIG. 3 is a diagram (diagram corresponding to FIG. 2B) illustrating a first modification of the projections 22 for shaping the openings 8 of the mesh the filter portion 4. As illustrated in FIG. 3, the projections 22 for shaping the openings 8 of the filter portion 4 may be formed only in the part of the first die 11 for shaping the filter portion cavity section 16 without being formed in the part of the second die 12 for shaping the filter portion cavity section 16.

(Second Modification)

[0044] FIG. 4 is a diagram (diagram corresponds to FIG. 2B) illustrating a second modification of the projections 22 for shaping the openings 8 of the filter portion 4. As illustrated in FIG. 4, the projections 22 for shaping the openings 8 of the filter portion 4 may be formed as the portion for shaping the filter portion cavity section 16 of the first die 11 and the portion for shaping the filter portion cavity section 16 of the second die 12. In the second modification, the heights of the projections 22A and 22B of the first die 11 and the second die 12 are half the height of the projections 22 in the embodiment and the first modification. When the first die 11 and the second die 12 are closed, the top surface of the projections 22A and the top surface of the projections 22B abut against each other.

(Third Modification)

[0045] Although virtual lines 25 making connection between the centers of the gates 18 and the center of the inner cylinder cavity section 14 deviate from the second central line 21 by 45 degrees (0=45 degrees) in the circumferential direction of the inner cylinder cavity section 14 in the injection molding die 10 according to the embodiment, the invention is not limited to the embodiment and the angle (0) formed by the virtual lines 25 and the second central line 21 may be any angle other than 45 degrees as long as variations in the filling rate at which the cavity 13 is filled with molten resin can be suppressed and the occurrence of burrs in the openings 8 of the filter portion 4 can be suppressed.

[0046] Although the mesh filter 1 injection-molded by the injection molding method and the injection molding die 10 according to the embodiment is installed in the fuel supply pipe connected to the fuel injection apparatus of a vehicle in the above aspect, the mesh filter 1 may be of course installed at an intermediate point of the oil pipe of a lubrication apparatus or the like of a vehicle. The invention is not limited to these examples and the mesh filter 1 can be used in a wide range of technical fields by being installed in the conduit of a water supply pipe or an air duct so as to remove the foreign matter mixed with a fluid (a liquid such as water or a gas such as air).

REFERENCE SIGNS LIST

[0047] 1: mesh filter [0048] 2: inner cylinder [0049] 2a: outer surface [0050] 2b: one end surface (end surface) [0051] 3: outer cylinder [0052] 3a: inner surface [0053] 4: filter portion [0054] 5: central axis [0055] 6: vertical rib [0056] 7: horizontal rib [0057] 8: opening [0058] 10: injection molding die [0059] 13: cavity [0060] 14: inner cylinder cavity section [0061] 15: outer cylinder cavity section [0062] 16: filter portion cavity section [0063] 17: central axis [0064] 18: gate [0065] 20: first central line [0066] 21: second central line